Central Graben
31 December 2013

7 - Columbus appraisal. Western flank of a large Paleocene dip closed anticline with shale-out up-dip. Deviated south west to prove the southern extension of Columbus in western branch of Upper Paleocene Forties channel. Well proved gas and oil with a GOC at 9,770 ft TVDSS and an OWC at 9,841 ft TVDSS (different to 23/16f-11 or 12 Well). Two oil samples were taken. Net gas pay was 46 ft and net oil pay was 46 ft. The Forties was pressure depleted due to Lomond production.
7 Z - Columbus appraisal. Western flank of a large Paleocene dip closed anticline with shale-out up-dip. Deviated north east to eastern branch of Forties channel. Only gas was encountered with 24 ft net pay and a GWC at 9,630 ft TVDSS. Water and gas samples were taken and core was cut. Upper Paleocene Forties was not pressure depleted.
7 Y - Columbus appraisal. Western flank of large Paleocene dip closed anticline with shale-out up-dip. Deviated to the south towards western branch of the Upper Paleocene Forties channel, on the margin of the Lomond structural closure. Pressure losses in the Forties caused sidetrack to be abandoned, likely caused by severe pressure depletion from Lomond.
7 X - Columbus appraisal. On the western flank of a large Paleocene dip closed anticline with shale-out up-dip. Deviated to the north west targeting a high amplitude anomaly close to the Upper Paleocene Forties channel bifurcation point. A 136 ft gas leg was drilled with a GWC at 9,778 ft TVDSS and 56.5 ft TVT net pay. Pressure was not depleted.

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